title: [Evaluation of urodynamic parameters following the placement of tension-free tape].
abstract: OBJECTIVE
  To analyse the urodynamic changes subsequent to the placement of TVT tension-free tape (retropubic tension-free vaginal tape) or TVT-O (obturator tension-free vaginal tape).
  
  
  METHODS
  We carried out a retrospective cohort study that included women with urodynamic diagnosis of stress incontinence, in whom we placed type TVT or TVT-O tension-free tape, and on whom we performed a urodynamic study one year later. We calculated the size of the sample based on the area of continence and it consisted of 15 women per group. We included 40 women. 22 had TVT placed and 18 had TVT-O. We carried out the trial between February 1999 and March 2009. We analysed the means of the pre and postoperative urodynamic parameters using the Student's t-test for dependent variables.
  
  
  RESULTS
  We noted an average decrease in the maximum flow of 9 ml/s following the placement of the TVT-O (p=0.05). For the TVT group, we noted an increase in the flow and micturition times of 5.3 and 6 seconds, as well as in the detrusor pressure at the maximum flow of 6.2 cm H(2)O and of the maximum detrusor pressure when voiding, of 8 cm H(2)O (p=0.37, 0.47, 0.21 and 0.12, respectively).
  
  
  CONCLUSIONS
  In women with urodynamic stress incontinence, the maximum flow decreased a year after the TVT-O was placed.
authors.affiliation: Coordinación de Urología Ginecológica, Instituto Nacional de Perinatología Isidro Espinosa de los Reyes, México Distrito Federal, México. quinterofernando@hotmail.com
authors.forename: F
authors.initials: F
authors.lastname: Quintero
authors.forename: V
authors.initials: V
authors.lastname: Gorbea
authors.forename: L
authors.initials: L
authors.lastname: Escobar
authors.forename: S
authors.initials: S
authors.lastname: Rodríguez
authors.forename: L
authors.initials: L
authors.lastname: Campos
authors.forename: R
authors.initials: R
authors.lastname: Solano
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008875:Middle Aged; D011183:Postoperative Complications / Q000453:epidemiology / Q000503:physiopathology; D011312:Pressure; D012189:Retrospective Studies; D012212:Rheology; D053825:Suburethral Slings; D014550:Urinary Incontinence, Stress / Q000601:surgery; D014555:Urination Disorders / Q000453:epidemiology / Q000503:physiopathology; D014563:Urodynamics